1. General Model Information
Name: TREe GROwth: Response of Plants to Interacting Stresses
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: organism, ecosystem
Type of model: not specified
Keywords: tree,soil,physiology, ozone stress, air pollution, water stress, nutrient deficiencies
The Boyce Thompson Institute for Plant Research
Cornell University Ithaca
Phone: (607) 254-1228
Email: David Weinstein
Electric Power Research Institute
3412 Hillview Avenue
Fax (A.) 607-254-1242
The simulation model, TREGRO, has been developed at the Boyce Thompson Institute
from funds supplied by the Electric Power Research Institute to analyze the response
of trees to multiple environmental stresses. TREGRO simulates the plant's ability to
utilize resources to fix carbon in photosynthesis, the allocation patterns used to
maintain carbon fixation and nutrient and water uptake, and the plant's ability to
repair pollution damage. The TREGRO model can aid in evaluating long term effects of
pollution on resource availability, potential for gradual deterioration of tree health
under long periods of pollution exposure, and imbalances in growth accompanying shifts
in carbon allocation.
TREGRO predicts growth and patterns of carbon allocation expected for an isolated tree
exposed to various levels of ozone, nutrient stress, and water availability. The tree
is divided into the following compartments: buds, a canopy consisting of up to ten leaf
year classes, branches, stem, and a fine and coarse root pool in each of three soil
layers. The model calculates the photosynthesis of the entire tree each hour as a
function of ambient environmental conditions and the availability of light, water, and
nutrients. To accomplish this task, the model keeps track of the the availability of
light, water, and nutrient resources needed for the fixation process, the quantity of
essential nutrients and water available in each soil horizon and the amount of these
resources taken up by the tree, and the amounts of these nutrient resources and fixed
carbon available and used to build the component tissues of the plant, and the flow of
carbon used to manufacture leaf tissue. The model predicts the growth of the tree over
periods ranging from one hour (the basic model time step) to many years. The model was
designed to be readily applicable to predicting the growth dynamics of most tree species,
and has been used to simulate both coniferous and deciduous trees.
Author of the abstract:
Plant Modeling Group :
Environmental Biology Program at Boyce Thompson Institute
II. Technical Information
Operating System(s): TREGRO runs on Macintosh personal computers equipped with systems software version 6.0.5 or later, 2 MB RAM and 3 MB free hard disk storage.
Programming Language(s): FORTRAN TREGRO might be obtained from the Electric Power Software Center, San Diego.
III. Mathematical Information
A pre-publication draft about
SENSITIVITY AND UNCERTAINTY ANALYSIS OF AN INDIVIDUAL PLANT MODEL AND PERFORMANCE OF ITS REDUCED FORM VERSIONS: A CASE STUDY OF TREGRO
by E. Shewliakowa, H. Dowlatabadi, M.J. Small -Department of Engineering & Public Policy Carnegie Mellon University Pittsburgh, PA 15213, USA might be downloaded here (as pdf-file).
Samuelson, L. J., M. A. Arthur, D. A. Weinstein, and G. S. Edwards. 1994.
Simulating the growth of northern red oak seedlings and mature trees in response to ozone using TREGRO. Abstract in Bulletin of the Ecological Society of America. 75 (2): 203.
Weinstein, D. A., and R. D. Yanai. 1994.
Integrating the effects of simultaneous multiple stresses on plants using the simulation model TREGRO. J. Environ. Qual. 23:418-428.
Weinstein, D. A., R. M. Beloin, R. D. Yanai, C. G. Zollweg, and B. Gollands.In review. TREGRO simulation model of the carbon, water, and nutrient balances of a plant-soil system. Model Version 3.0. Model description and Parameter Requirements. Electric Power Research Institute. Research Project 2799-1.
Weinstein, D. A., R. M. Beloin, R. D. Yanai, C. G. Zollweg. 1992.
TREGRO simulation model of the carbon, water, and nutrient balances of a plant-soil system. Volume 1: Model Version 1.74 Description and Parameter Requirements. Electric Power Research Institute. Research Project 2799-1.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: October, 19th 1997 M.Sonntag
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:51 CEST 2002